The 97% figure comes from just 77 scientists in a survey of over 3100 scientists. The survey-takers threw out over 3000 responses to get the result they wanted. 2nd, the survey did not ask whether climate change is "driven" by humans; it asked if human activity is a "significant contributing factor" in changing global temperature. "Significant" might be a 10% effect; and that activity might be deforestation or agriculture, rather than CO2 emissions'